TT-3000E mini-C GMDSS User Manual - Polaris-as.dk

TT-3000E mini-C GMDSS User Manual
costal section. The TT-3000E system can not determine
automatically what the current costal area is, so if the user
want to receive these EGCs the relevant area codes must be
set explicitly (each costal area, along with the
corresponding NAVTEX transmitter, is designated by a
letter ‘A’ to ‘Z’). Further information can be found in the
‘Admiralty List of Radio Signals’ published by the
Hydrographer of the Navy in the UK.
Each EGC has a priority assigned: Routine, Safety, Urgent, or
Distress. When an EGC with urgent or distress priority is
received the receiver is required to indicate this clearly in
order to notify the crew.
Distress alerting
A GMDSS installation that supports distress alert will have
an alarm button that will initiate an alert when pressed for
more than 5 seconds. The distress alert protocol is
carefully designed so that it will get through regardless of
the current state and activity of the Inmarsat-C transceiver
(provided, of course, that the installation is working and
active).
Having said that, there are a number of configuration issues
that should be considered. The user should select which
LES that will receive the alert and the main advantage of
doing this is that it determines beforehand how subsequent
emergency communication should be routed. The alert
itself will in any case be passed on to the authorities
closest to the distress position. If no LES is chosen by the
user the TT-3000E will select one automatically.
The TT-3000E also has an option of choosing a cause for
the alert and the position that will reported with the alert;
the latter will rarely be relevant since the TT-3026C
transceiver has a built-in GPS unit that will provide a
position automatically.
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